A dystenoid nervous system is an arrangement of

ganglia A ganglion (: ganglia) is a group of neuron cell bodies in the peripheral nervous system. In the somatic nervous system, this includes dorsal root ganglia and trigeminal ganglia among a few others. In the autonomic nervous system, there a ...

in the anterior region of some

mollusc Mollusca is a phylum of protostome, protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant taxon, extant species of molluscs are recognized, making it the second-largest animal phylum ...

s where the cerebral and pleural ganglia are situated closer to each other than they are in those molluscs with the more archaic hypoathroid nervous system, but still further apart than those animals with an evolutionarily more recent epiathroid nervous system. Examples of animals having dystenoid systems include '' Macleaniella moskalevi'', '' Teuthirustria cancellata'', and '' Fedikofella caymanensis'' (weakly dystenoid in all three). These are deep sea

limpet Limpets are a group of aquatic snails with a conical gastropod shell, shell shape (patelliform) and a strong, muscular foot. This general category of conical shell is known as "patelliform" (dish-shaped). Existing within the class Gastropoda, ...

s belonging to the superfamily Cocculinoidea.

References

{{reflist Mollusc anatomy